don't forget viscosity

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Core Laboratories and The Petroleum Technology Transfer Council 2nd Annual Reservoir Engineering Symposium. From the Matrix to the Market What You Dont Know CAN Hurt You

Dont Forget Viscosity Dave Bergman BP America July 28, 2004

BackgroundViscosity Important to: Reservoir Modeling Production Rates Mobility for water Flooding

Flow Assurance Rates Heat Transfer

Facility Pump Design Equipment Sizing Pipeline Diameters Heat Transfer Area

Just about any calculation you make will be dependent on Viscosity. As Many Correlations as Fish in the Sea Are all equally valid for your data? Without data, +_50% (1 STD) errors in Prediction

BP/DFB 2

Export Pipeline Example:Pressure Drop by Correlation

10000 100F 76F 60 51 44F 40

2500

1000

2000

Viscosity, cp

Thodos cp100 1500 Pressure, psia 1000 500 0 2 4 6 8 10 12 14 16 18 20 Segment(Miles)

Beggs cp Temperature, F

10

1

BP/DFB 3

Review Calculations

Neither Correlation was Correct BR correlation used LOG(T,F) so Viscosity= Infinity at T=0F Wrong temperature Dependency over all temperatures, but most noticeable below 70F, resulting is too much change with Temperature Thodos also had wrong temperature Dependency, under estimating change with Temperature. New Correlation Needed for extrapolation Versus temperature,